hmmm......do this 5 times a day and burn 500 calories. 10 times = 1,000 calories. There are 5 commercial breaks in a 1 hour tv episode. Burn 500 calories while watching your favorite show. Now, that sounds like a plan!
Ball exercises core workout. I love my yoga ball. I find myself sitting on it al my desk sometimes. It does help my posture and works the core at the same time. These are great simple exercises to try at home.